Heating apparatus



Feb. 10, 1931. R HUTCl-"NSON 1,791,504

HEATING APPARATUS Filed 00t- 9, 1928 Patented Feb. 10, 1931 untel RAYIVIQND HUTCHNSON, GF BRSTOL, CONNECTECT, ASSIGNOB TO THE NEWT DE- ??ETUBE MANUFACTURING' COMPANY,

'DION OF CONNECTICUT OF BRISTOL, CONNECTGUT, A CORPORA- I-IE'ATNG- APPARATUS Application iled October 9, 1928. Serial No. 311,369.

This invention relates to heating lapparatus and comprises all the features of novelty herein disclosed. An object-of the invention is to provide improved apparatus for heating 5' articles and more especially one in which the heatingchamber is well i lated and wherein the articles can be'conveniently introduced and removed at'se'lected stations. To these ends and'to improve generally and in detail u pon devices of this character, the invention further consists in the yarious matters hereinafter described and claimed.

lnfits broader aspects, the invention is not necessarily limited to the specific construction i selected' for illustrative'purposes in the accompanyingY drawings in which Fig. 1 is a plan view.

Fig; 2fis a side elevation partly in section and Fig. 3 is a diagram.

The base comprises a casing composed of a lower section and an upper section 12 bolted together and supporting a vertical shaft 14 for rotation on ball bearings 16 and 18 inthe casing. The shaft is driven at slow speedy by a motor (not shown) connected to a worm 2O driving avworm wheel 22- keyed to Ythe shaft. Tov the upper end o-f the shaft is keyed a spider 24 having verticall webs 26 boltedto a series of radial arms 28 in the form of angle irons to the horizontal lcgsof which are secured two flat'superimposed rings7 one ring 8O being of metal and the other ring 82 being of asbestos paper or the like to insulate l articles carried on the ring from heating apparatus below it. Ring 30 forms a rotary work support or carrier. Y

The hub 34 of a wheel or spider 36 is keyed to the shaft 14 and hasa supporting ledge 38 for rings 40V and 42 of heat insulating material which insulate the wheel or spider from a heated shelfl or table 44 which is secured to the wheel by bolts 46. The shelf or table forms a rotary' work support or carrier. The rings 40 and 42and the shelf or table? are conveniently formed in' segmental sections.

The shelf or tablek is enclosed within anv trance openings to insert the work. Supporting' channel irons 50 radiate from the upper casing section 12 to which they are secured by bolts 52. At the ends of the channel irons are secured upricht angle irons 54 secured at the top to horizontal angle irons 56 attached to and radiating fromV a Vring 58 surronndin the shaft 14. A bottom plate 80, in the form of a ring, is fastened to the channel irons and stidened by angle irons 62. The plate GO supports a thick ring of asbestos cement or the like recessed to receive arcuate plates 66 carrying heating units 68 which are located in a space narrower than that between rdepending flanges of the table or shelf and supply heat to it. rlwo rings 70 and 72 of angle iron, bolted to the plate 80. form a channel 73 receiving a depending flange .74 on the wheel or spider 36. y preferably filled with sand or some loose re` rractory material to seal the inner periphery of the annular heating chamber 48 containiing the heating units. circular plate T6 secured to the horizontal flanges of the angle irons 5G and carries a ring Z8 of angle iron entering a channel 79 in the wheelior spider 36. This channel is likewise filled with sand or the like to seal the joint.

rl"he outer periphery of the annular heating chamber is closed by a cylindrical wall or board 8() preferably made in arcuate sections and composed of asbestos or similar heat resisting and insulating material bolted to the angle irons 54. The wall 8O and an angle iron ring 82 support a removable ring-like cover, preferably of the same material as the wall and also made in arcuate sections 84, 8Gj 88 and 90. lhe section 84 has a notch or recess 92 registering with a notch or recess 94 in wall 8O to facilitate inserting a piece of work onto the rotary shelf or table 44 which carries the work around in the heating chamber. The work can be removed at any selected one of a series of unloading stations, the eX- tent of arcuate travel being determined by the size-'of work or the time necessary to heat it. The section 86'has two notches or recesses 96 and 98 at which the work can be removed and thesection 88 has one such notch or recess 100, The notches all register with notches in The channel is,

the cylindrical wall 8O and the angular spacing of the notches varies in order that the arc of travel and hence the time ot heating can be selective. For inst-aime, the work may be inserted at any one of the notches and removed from the same notch or any ot the others. Also worl; of differentsir/es can be loaded at dillcrent station.I and removed as desired and any notches not in use. can be temporarily covered by a heat insulating plate as indicated at 102 covering the notch 98.

To facilitate unloading, a deflector may be placed at any selected unloading station. One such deflector is shown at the station 9G and comprises a curved angle iron 104 pivotally attached at 10G to the cover section S6 and having its vertical flange 108 depending into the path of the work-pieces on the table 44 to deflect or cam them outwardly near the periphery where they can be slid out through one of the notches in the cylindrical wall 80. The deflector can be clamped in any selected angular position by a clamping bolt 110 entering a slot 112 in an arcuate supporting angle iron 114 bolted on top of the plate 76 and cover section S6 and extending out into the notch 96.

The speed of the table may be adjusted to vary the amount of heating but, as indicated diagrammatically in Fig. 3, it is preferred to arrange the heating units in a plurality of independent series or sectors with each series having a plurality ot selective resistance Wires. A switch 116, for instance, has a wire 118 leading to one resistance wire in one series or sector, a wire 120 leading to another resistance wire, and a single return wire 122. One resistance wire will produce a low heat, another a greater heat, and both together a still greater heat. Another switch 124 is similarly connected to heating units in another series or sector, etc. so that the hea supplied to the various sectors can be widely varied if desired. The switches may be replaced by thermostats for automatic control.

The apparatus can be used for heating or cooking a variety of things though more especially designed for heating metal parts which need to be expanded for assembly with unheated parts. For instance, in assembling the balls of a ball bearing between the inner race ring and the outer race ring, insertion of the balls into the races is facilitated by heating the outer race ring. Sometimes the two racc rings are matched in which case the operator places the outer race ring on the table 44 at one of the loading stations and places the inner race ring on the rotary ring 3() above it. Both articles then travel at the same speed to the selected unloading station where they are taken ofi and assembled with the balls.

I claim:

1. In apparatus of the character described, a casing, heating devices inthe casing, a movable carrier mounted in the casing to carry articles past the heating devices, a second movable carrier outside the casing and movable in unison with the first carrier, and heat insulating material between the carriers to obstruct access of heat trom the casing to articles outside the casing on the second carrier; substantially as described.

2. In apparatus of the character described, a casing having heat insulating Walls, heating devices in the casing, an annular carrier rotatable in the casing adjacent to the heating devices, a rotary wheel supporting the carrier, and heat insulating means interposed between the carrier and the Wheel; substantially as described.

3. In apparatus oit' the character described, a casing, heating devices in the casing, a movable carrier mounted in the casing to travel past the heating devices, the casing having anV unloading station, a deflecting arm pivoted to the casing and arranged adjacent to the unloading station, and means for securing the arm in adjusted position; substantially as described.

4. In apparatus ofthe character described, a casing, heating devices in the casing, a circular carrier mounted inside the casing and rotatable past the heating devices, and a second rotatable carrier of circular form mounted outside the casing and above the first carrier, said second carrier being rotatable in unison with the first carrier and comprising a supporting ring with a layer of heat insulating material between it and the casing; substantially as described.

5. In apparatusof the character described, a circular casing, heating devices in the casing, a circular carrier mounted inside the casing, a shaft for rotating the carrier and projecting through the top ot' the casing, the upper wall of the casing having loading openings, and a second circular carrier mounted on the upper end of the shaft and having a smaller diameter than the first carrier; substantially as described.

6. In apparatus oi the character described, a casing, heating devices in the casing, a circular carrier mounted inside the casing, a shaft for rotating the carrier and projecting through the top of the casing, and a second carrier of circular form secured to the shaft outside the casing, said second carrier comprising an upper ring with a layer of heat insulating material between it and the casing; substantially as described.

7. In apparatus of the character described, a casing having heat insulating walls, an annular carrier rotatable in the casing, a rotary wheel supporting the carrier, heat insulating means interposed between the carrier and the wheel, the annular carrier having depending flanges at its inner and outer peripheries, and heating devices in the casing below the carrier and included Within a space Css narrower than that between said flanges; substantially as described.

8. In apparatus of the character described, a circular casing, heating devices in the casing, a circular carrier mounted inside the casing, means for rotating the carrier, the upper Wall of the casing and the outer Wall having registering notches forming loading and unloading stations at the periphery of the carrier, and said stations being,` spaced apart at various angular distances; substantially as described.

In testimony whereof I hereunto aHiX my signature.

RAYMOND HTCHINSON. 

